+/**
+* \ingroup Validators
+* A validator which checks that objects selected for feature attributes are different (not the same)
+*/
+class PartSet_DifferentObjectsValidator : public ModelAPI_RefAttrValidator
+{
+ public:
+ //! Returns true if the attribute is good for the feature attribute
+ //! \param theAttribute an attribute
+ //! \param theArguments a list of arguments (names of attributes to check)
+ virtual bool isValid(const AttributePtr& theAttribute,
+ const std::list<std::string>& theArguments) const;
+
+protected:
+ //! Casts the attribute to an attribute kind and obtains an object value if it is possible
+ //! \param theAttribute a source attribute to find object
+ //! \return an attribute object or NULL
+ ObjectPtr getObject(const AttributePtr& theAttribute) const;
+
+ //! Checks whethe other feature attributes has a reference to the given attribute
+ //! \param theAttribute a source attribute to find object
+ //! \return a boolean value
+ bool featureHasReferences(const AttributePtr& theAttribute) const;
+};
+
+/**
+* \ingroup Validators
+* A Validator which validates tha selected object is a Sketch
+*/
+class PartSet_SketchValidator : public ModelAPI_ResultValidator
+{
+ public:
+ /// Returns True if the given object is a sketch
+ /// \param theObject an object
+ virtual bool isValid(const ObjectPtr theObject) const;
+};